Minutes of Proceedings. xix 
mmiles long, 28 feet wide, to carry 4 feet of water, carrying 100 
‘million gallons per day, to increase, from storm water, the supply of 
water to Van Wyk’s Vlei. He also gave an account of the circum- 
stances of the Vlei, its extent, depth, the amount of water in it, and 
-the extent of land under cultivation in various years. 
The thanks of the Society were voted to Mr. Garwood Alston. 
Mr. R. Trimen exhibited (on behalf of the Rev. G. H. R. Fisk) 
some specimens of the so-called “Jumping Eggs,” obtained from the 
leaves of the common “ Taai-bosch” (hus-spec). These little white 
- sacs contain a fat whitish larva (which may be either coleopterous 
-or hymenopterous) which, by jerking its curved caudal extremity 
against the side of the tough thin tegument of the sac literally 
“jumps in and with its sac with some force for a distance consider- 
vable in comparison with its size. The white sac lies firmly invested 
‘by the lower and upper membranes of the leaf, and, in nature, it does 
not appear that the jumping (so energetically indulged in when 
zartificial removal of the sac takes place) can ever occur. 
Mr. Trimen remarked that when taken out of the sac, the larva, 
‘though unable to jump, passed its time in perpetually flicking and 
jerking its tail He and Mr. Péringuey and several other persons 
had tried to rear the perfect insect from this larva, but without 
success. 
Prof. MacOwan exhibited Vermorel’s Knapsack Spraying Pump 
for the distribution of Insecticides. 
Mr. Péringuey said that although the mechanical means necessary 
‘to produce the requisite pressure for the jet had been found not to 
act well, still the pump was much used by viticulturists in France. 
Mr. Péringuey then read a short note on a Dipterous fly that attacks 
-human beings, exhibiting a specimen of the insect from Natal sent 
by Col. J. H. Bowker. | 
Ordinary Monthly Meeting. 
WEDNESDAY, OcTOBER 28, 1891. 
Mr. L. Pertncutry, F.E.S., Vick-PRESIDENT, IN THE CHAIR. 
* The undermentioned presents were announced and the thanks of 
the Society voted to the donors : 
Victorian Year Book for 1889-90, Vol. II. 
C2 
